Sectional grinding wheel



May 28, 1929- .1. L. BALLASH 1,714,754

SECTIONAL GRINDING WHEEL I Filed March 2, 1927 Patented May 1929..

- UNHTED sTEs IBALLASH, or 'crnvnrannonio, Ass'reuoa TO THE STERLING GRINDING,

wHgELeo PAnY, or TIFFIN, OHIO, A CORPORATION or OHIO.

aosnrn L.

eer e "tau? snc'rIoriAL enmnmewnnnn 1 Application filed .March 2,

This invention relates to sectional grinding wheels being more particularly directed to that type of wheel in which a side face is used for grinding, and has for an'objectgto provide such a wheel made up of a SGIIES. of inter-fitting sections; A further object of the invention is to provide a sectional. grinding wheel in which the blocks of abrasive material formingthe sections of the wheel areso joined together that article's being ground in passage over the I joints between the sections'will not be damaged and will not d-amagc the Wheel. A further object is to provideasectional grinding wheel in which the segmental blocks of abrasive material forming .the sections of the Wheelare so fitted togctheras to automatically compensate for slight variations min the dimensions of the "blocks from the theoretically exact form' so that the blocks may be used as they come from the molds without finishing operations. 1

With the above and other objects in view,. the invention may be said to comprise the structure as illustrated in the accompanyin drawing hereinafter described and particularly set forth' in the appendedclaims, together with such variations and modifications thereof as will be apparent to one skilled in the art to which the invention appertains.

Reference should behad to the accompanying drawings forming a part of this specification, in which: Fig. 1 is a plan view of a sectional grinding Wheel embodying my invention; Fig. 2 is a sectional View taken on indicated at 22 in Fig. 1; and v Fig. 3 is a. perspective-view of one of the blocks. q I

Referring to the accompanying drawing, the grinding wheelis annular in form an is built up of a series of identical blocks 1, each of which has an-inner face 2 of cylindrical curvature and anouter 'face 3 conforming to a concentric cylindrical surface. One end face of the block 1 is provided along the inner and .outersides thereof' with flat p0rtions4 which lie in a plane which is spaced from the axis of curvature of the inner and outer faces 2 and 3, or, in other words, at an angle to radial planes. A transversely arouthe line ate groove 5 of uniform curvature and depth extends across the end of the block between the flat portions 4 and substantially midway between the inner and outer sides 2 and 3.

. and since the grooves and-ribs are of trans- ;joints, which extend at anang'le to radiiof 1927. 'Serial No. 171,963.

The dpposite end of the block isjprovided wlth at portions 6 in a plane which conv verges inwardly toward the plane of the-flat portions 4 of the opposite end and whichis also disposed at an angle tov radial planes normal to the inner and outer surfaces Z-and 3. Between the flat portions 6, an arcuate rib 7 extends across ,the end of the block which is of a size to fit within the arcuate groove of an adjacent block. When the sections are interfitted as shown 1n Fig. v1, the outer surfaces 3 of the sections .form the substantially cylindrical periphery; of the wheel, and the inner surfaces 2 form.

the substantially cylindrical hub openin ofrm' the wheel. The ribs 7 are of a heightslig tly greater than the depth of-the grooves 5 so that there is a slight clearance between the] adjacent flat portions 4 and 6. of the blocks, '75 versely arcuate form, they provide a-rocking adapter bearing between the adjoining; sections, permitting the sections to rock one upon the other during assembly so that slight inaccuraciesin the dimensions of the blocks so will be compensated for. The sections may be taken directly from a mold and fitted together in a suitable form or chuck and then secured upon'a suitable supporting disk 9. If the compensation providedfor by the rocking bearings between the sections is in-' s'ufiicient, one or more canvas shims, as indiv cated at 8 in Fig. 1, maybe inserted in the grooves 5 to spread the sections,

When the grinding wheelf is in use, the

the face of the wheel'againstwhichthe article being ground enga s will remain atan angle to the face of t e articlev and pass endwise beneath the ar icle and along the d length thereof during r tation of the wheel so that neither the grinding wheel nor as, ticle being ground will be dama ed.

Having thus described my invention, I claims.-

1. A sectional grinding wheel formed of a series of inter-fitting segmental blocks, the contiguous faces of each pair of contiguous .bl ocks having an adapter bearing formed by a transversely concave groove in one block extending'across the same intermediate the 1nner and outer edges and a correspondingly positioned rib on the other block adapted to lit and have a. rocking bearing in the roove,

foo

there being a clearance between the a jacent 110 n I I faces of the blocks between the rile and groove series of interfitting segmental blocks, the

contiguous faces of each pair of contiguous blocks being disposed at an angle to radii of said wheel and having an adapter bearing formed by a transversely'concave groove in one block extending across the same intermediate the inner and outer edges anda correspondingly postioned rib on the other block adapted to fit and have a rocking bearing inthe groove, there being a clearance ,between the adjacent faces of the blocks between-the rih and groove and inner and outer edges of said faces.

3. An abrasive block adapted to form" one of a series of identical sections of an annular grinding Wheel and having inner and outer concentric faces of uniform curvature and inwardly converging end faces inclined with respect vtoplanes normal to said inner and outer faces, one of said end faces having a transversely arouate groove. extending across the same intermediate said inner and outer faces, and the other of said end faces having a transversely arcuate ribadapted to fit in the groove of an identical block.

In testimony whereof, I hereunto affix my signature.

- JOSEPH L. BALLASH. 

